Beam focal spot position determination for an Elekta linac with the Agility® head; practical guide with a ready-to-go procedure

Journal of Applied Clinical Medical Physics
Jacek M ChojnowskiD I Thwaites

Abstract

A novel phantomless, EPID-based method of measuring the beam focal spot offset of a linear accelerator was proposed and validated for Varian machines. In this method, one set of jaws and the MLC were utilized to form a symmetric field and then a 180o collimator rotation was utilized to determine the radiation isocenter defined by the jaws and the MLC, respectively. The difference between these two isocentres is directly correlated with the beam focal spot offset of the linear accelerator. In the current work, the method has been considered for Elekta linacs. An Elekta linac with the Agility® head does not have two set of jaws, therefore, a modified method is presented making use of one set of diaphragms, the MLC and a full 360o collimator rotation. The modified method has been tested on two Elekta Synergy® linacs with Agility® heads and independently validated. A practical guide with instructions and a MATLAB® code is attached for easy implementation.

References

Oct 9, 2009·Medical Physics·Eric E KleinUNKNOWN Task Group 142, American Association of Physicists in Medicine
Dec 13, 2012·Medical Physics·Balazs J NyiriLee H Gerig
May 27, 2017·Journal of Applied Clinical Medical Physics·Koren SmithLynne A Fairobent
Aug 9, 2017·Journal of Applied Clinical Medical Physics·Jacek M ChojnowskiDavid I Thwaites

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Citations

Dec 20, 2018·Physics in Medicine and Biology·Hans L RiisPejman Rowshanfarzad
Dec 4, 2019·Australasian Physical & Engineering Sciences in Medicine·Jacek M ChojnowskiDavid I Thwaites
Oct 24, 2020·Journal of Applied Clinical Medical Physics·Adriaan A van AppeldoornJochem W H Wolthaus
Jan 14, 2021·Journal of Applied Clinical Medical Physics·Luis MuñozGiordano Biasi

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Software Mentioned

Elekta
iView
MATLAB

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